Plaster plug



FIG. 1 is a top, plan view of a plaster plug showing my new design;

FIG. 2 is a front, right perspective view thereof, the front, left perspective view being a mirror image;

FIG. 3 is a rear, left perspective view thereof, the rear, right perspective view being a mirror image;

FIG. 4 is a top, plan view of a second embodiment of a plaster plug showing my new design;

FIG. 5 is a front, right perspective view thereof, the front, left perspective view being a mirror image; and,

FIG. 6 is a rear, left perspective view thereof, the rear, right perspective view being a mirror image. 

CLAIM The ornamental design for a plaster plug, as shown and described. 